SELECT 
  cscart_product_feature_variant_descriptions.variant, 
  cscart_product_feature_variants.variant_id, 
  cscart_product_feature_variants.feature_id, 
  cscart_product_features_values.variant_id as selected, 
  cscart_product_features.feature_type, 
  cscart_seo_names.name as seo_name, 
  cscart_seo_names.path as seo_path, 
  cscart_product_feature_variants.mdc_variant 
FROM 
  cscart_product_feature_variants 
  LEFT JOIN cscart_product_feature_variant_descriptions ON cscart_product_feature_variant_descriptions.variant_id = cscart_product_feature_variants.variant_id 
  AND cscart_product_feature_variant_descriptions.lang_code = 'de' 
  INNER JOIN cscart_product_features_values ON cscart_product_features_values.variant_id = cscart_product_feature_variants.variant_id 
  AND cscart_product_features_values.lang_code = 'de' 
  AND cscart_product_features_values.product_id = 536 
  AND cscart_product_features_values.feature_id = cscart_product_feature_variants.feature_id 
  LEFT JOIN cscart_product_features ON cscart_product_features.feature_id = cscart_product_feature_variants.feature_id 
  LEFT JOIN cscart_seo_names ON cscart_seo_names.object_id = cscart_product_feature_variants.variant_id 
  AND cscart_seo_names.type = 'e' 
  AND cscart_seo_names.dispatch = '' 
  AND cscart_seo_names.lang_code = 'en' 
WHERE 
  1 
  AND cscart_product_feature_variants.feature_id IN (
    1101, 1024, 1122, 1033, 1055, 1111, 1049, 
    1046, 1056, 1125, 1045, 1119, 1120, 
    1126, 1102, 1029, 1030, 1128, 1038, 
    1113
  ) 
GROUP BY 
  cscart_product_feature_variants.variant_id 
ORDER BY 
  cscart_product_feature_variants.position, 
  cscart_product_feature_variant_descriptions.variant

Query time 0.00272

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "37.87"
    },
    "ordering_operation": {
      "using_filesort": true,
      "grouping_operation": {
        "using_temporary_table": true,
        "using_filesort": false,
        "nested_loop": [
          {
            "table": {
              "table_name": "cscart_product_features_values",
              "access_type": "range",
              "possible_keys": [
                "PRIMARY",
                "fl",
                "variant_id",
                "lang_code",
                "product_id",
                "fpl",
                "idx_product_feature_variant_id"
              ],
              "key": "idx_product_feature_variant_id",
              "used_key_parts": [
                "product_id",
                "feature_id",
                "lang_code"
              ],
              "key_length": "12",
              "rows_examined_per_scan": 34,
              "rows_produced_per_join": 13,
              "filtered": "100.00",
              "using_index": true,
              "cost_info": {
                "read_cost": "3.22",
                "eval_cost": "2.70",
                "prefix_cost": "14.42",
                "data_read_per_join": "10K"
              },
              "used_columns": [
                "feature_id",
                "product_id",
                "variant_id",
                "lang_code"
              ],
              "attached_condition": "((`danishecarter_latest`.`cscart_product_features_values`.`product_id` = 536) and (`danishecarter_latest`.`cscart_product_features_values`.`feature_id` in (1101,1024,1122,1033,1055,1111,1049,1046,1056,1125,1045,1119,1120,1126,1102,1029,1030,1128,1038,1113)) and (`danishecarter_latest`.`cscart_product_features_values`.`lang_code` = 'de'))"
            }
          },
          {
            "table": {
              "table_name": "cscart_product_feature_variants",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY",
                "feature_id"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "variant_id"
              ],
              "key_length": "3",
              "ref": [
                "danishecarter_latest.cscart_product_features_values.variant_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 0,
              "filtered": "6.22",
              "cost_info": {
                "read_cost": "13.52",
                "eval_cost": "0.17",
                "prefix_cost": "30.64",
                "data_read_per_join": "2K"
              },
              "used_columns": [
                "variant_id",
                "feature_id",
                "position",
                "mdc_variant"
              ],
              "attached_condition": "(`danishecarter_latest`.`cscart_product_feature_variants`.`feature_id` = `danishecarter_latest`.`cscart_product_features_values`.`feature_id`)"
            }
          },
          {
            "table": {
              "table_name": "cscart_product_features",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "feature_id"
              ],
              "key_length": "3",
              "ref": [
                "danishecarter_latest.cscart_product_features_values.feature_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 0,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "0.84",
                "eval_cost": "0.17",
                "prefix_cost": "31.64",
                "data_read_per_join": "1014"
              },
              "used_columns": [
                "feature_id",
                "feature_type"
              ]
            }
          },
          {
            "table": {
              "table_name": "cscart_product_feature_variant_descriptions",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "variant_id",
                "lang_code"
              ],
              "key_length": "9",
              "ref": [
                "danishecarter_latest.cscart_product_features_values.variant_id",
                "const"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 0,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "0.84",
                "eval_cost": "0.17",
                "prefix_cost": "32.65",
                "data_read_per_join": "2K"
              },
              "used_columns": [
                "variant_id",
                "variant",
                "lang_code"
              ]
            }
          },
          {
            "table": {
              "table_name": "cscart_seo_names",
              "access_type": "ref",
              "possible_keys": [
                "PRIMARY",
                "dispatch"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "object_id",
                "type",
                "dispatch",
                "lang_code"
              ],
              "key_length": "206",
              "ref": [
                "danishecarter_latest.cscart_product_features_values.variant_id",
                "const",
                "const",
                "const"
              ],
              "rows_examined_per_scan": 5,
              "rows_produced_per_join": 4,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "4.37",
                "eval_cost": "0.84",
                "prefix_cost": "37.87",
                "data_read_per_join": "7K"
              },
              "used_columns": [
                "name",
                "object_id",
                "type",
                "dispatch",
                "path",
                "lang_code"
              ]
            }
          }
        ]
      }
    }
  }
}

Result

variant variant_id feature_id selected feature_type seo_name seo_path mdc_variant
12777 23089 1055 23089 N
18000 23134 1102 23134 N 18000
18000.000 23142 1038 23142 N
2 23005 1101 23005 S 2
201807 23143 1046 23143 N 201807
375 23145 1029 23145 N 375
4x2 23040 1113 23040 S WHEEL_DRIVE_4x2
558917 23144 1045 23144 N 558917
ABS 23135 1128 23135 M
Automatic 23087 1125 23087 S
Automatic air conditioning 18903 1024 18903 S AUTOMATIC_CLIMATISATION
auxiliaryHeating 23136 1128 23136 M
Diesel 22797 1056 22797 S DIESEL
ESP 23137 1128 23137 M
Euro6 22756 1049 22756 S EURO6
Fixed 18937 1030 18937 S FIXED
Long distance traffic 23035 1111 23035 S LONG_DISTANCE_TRAFFIC
No 18943 1033 18943 S N
Red 23111 1126 23111 S
Standard tractor/trailer unit 23085 1119 23085 S
Used vehicle 23075 1122 23075 S
VOLVO 23086 1120 23086 E volvo-en