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 = 'en' 
  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 = 'en' 
  AND cscart_product_features_values.product_id = 336 
  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 (
    1055, 1041, 1046, 1050, 1047, 1044, 1069, 
    1100, 1098, 1099, 1101, 1056, 1054, 
    1058, 1043, 1053, 1068, 1045
  ) 
GROUP BY 
  cscart_product_feature_variants.variant_id 
ORDER BY 
  cscart_product_feature_variants.position, 
  cscart_product_feature_variant_descriptions.variant

Query time 0.00301

JSON explain

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  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "13.79"
    },
    "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": [
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                "fl",
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                "lang_code",
                "product_id",
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              ],
              "key": "idx_product_feature_variant_id",
              "used_key_parts": [
                "product_id",
                "feature_id",
                "lang_code"
              ],
              "key_length": "12",
              "rows_examined_per_scan": 18,
              "rows_produced_per_join": 2,
              "filtered": "100.00",
              "using_index": true,
              "cost_info": {
                "read_cost": "1.40",
                "eval_cost": "0.50",
                "prefix_cost": "3.60",
                "data_read_per_join": "1K"
              },
              "used_columns": [
                "feature_id",
                "product_id",
                "variant_id",
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              ],
              "attached_condition": "((`danishecarter_25_march`.`cscart_product_features_values`.`product_id` = 336) and (`danishecarter_25_march`.`cscart_product_features_values`.`feature_id` in (1055,1041,1046,1050,1047,1044,1069,1100,1098,1099,1101,1056,1054,1058,1043,1053,1068,1045)) and (`danishecarter_25_march`.`cscart_product_features_values`.`lang_code` = 'en'))"
            }
          },
          {
            "table": {
              "table_name": "cscart_product_feature_variants",
              "access_type": "eq_ref",
              "possible_keys": [
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                "feature_id"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
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              "ref": [
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              "rows_examined_per_scan": 1,
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              "used_columns": [
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            }
          },
          {
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              },
              "used_columns": [
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              ]
            }
          },
          {
            "table": {
              "table_name": "cscart_product_feature_variant_descriptions",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
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              ],
              "key_length": "9",
              "ref": [
                "danishecarter_25_march.cscart_product_features_values.variant_id",
                "const"
              ],
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              "cost_info": {
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              },
              "used_columns": [
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                "variant",
                "lang_code"
              ]
            }
          },
          {
            "table": {
              "table_name": "cscart_seo_names",
              "access_type": "ref",
              "possible_keys": [
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              ],
              "key": "PRIMARY",
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              "cost_info": {
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                "data_read_per_join": "6K"
              },
              "used_columns": [
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                "object_id",
                "type",
                "dispatch",
                "path",
                "lang_code"
              ]
            }
          }
        ]
      }
    }
  }
}