SELECT 
  cscart_product_feature_variant_descriptions.*, 
  cscart_product_feature_variants.*, 
  cscart_seo_names.name as seo_name, 
  cscart_seo_names.path as seo_path 
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' 
  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 (596) 
ORDER BY 
  cscart_product_feature_variants.position, 
  cscart_product_feature_variant_descriptions.variant 
LIMIT 
  0, 14

Query time 0.01119

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "4632.82"
    },
    "ordering_operation": {
      "using_temporary_table": true,
      "using_filesort": true,
      "nested_loop": [
        {
          "table": {
            "table_name": "cscart_product_feature_variants",
            "access_type": "ref",
            "possible_keys": [
              "feature_id"
            ],
            "key": "feature_id",
            "used_key_parts": [
              "feature_id"
            ],
            "key_length": "3",
            "ref": [
              "const"
            ],
            "rows_examined_per_scan": 723,
            "rows_produced_per_join": 723,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "96.00",
              "eval_cost": "144.60",
              "prefix_cost": "240.60",
              "data_read_per_join": "1M"
            },
            "used_columns": [
              "variant_id",
              "feature_id",
              "url",
              "color",
              "position",
              "mdc_variant",
              "mdc_maker"
            ]
          }
        },
        {
          "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_31jan.cscart_product_feature_variants.variant_id",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 723,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "723.00",
              "eval_cost": "144.60",
              "prefix_cost": "1108.20",
              "data_read_per_join": "2M"
            },
            "used_columns": [
              "variant_id",
              "variant",
              "description",
              "page_title",
              "meta_keywords",
              "meta_description",
              "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_31jan.cscart_product_feature_variants.variant_id",
              "const",
              "const",
              "const"
            ],
            "rows_examined_per_scan": 4,
            "rows_produced_per_join": 2892,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "2946.22",
              "eval_cost": "578.40",
              "prefix_cost": "4632.82",
              "data_read_per_join": "4M"
            },
            "used_columns": [
              "name",
              "object_id",
              "type",
              "dispatch",
              "path",
              "lang_code"
            ]
          }
        }
      ]
    }
  }
}