SELECT 
  pf.feature_id, 
  pf.company_id, 
  pf.feature_type, 
  pf.parent_id, 
  pf.display_on_product, 
  pf.display_on_catalog, 
  pf.display_on_header, 
  cscart_product_features_descriptions.description, 
  cscart_product_features_descriptions.internal_name, 
  cscart_product_features_descriptions.lang_code, 
  cscart_product_features_descriptions.prefix, 
  cscart_product_features_descriptions.suffix, 
  pf.categories_path, 
  cscart_product_features_descriptions.full_description, 
  pf.status, 
  pf.comparison, 
  pf.position, 
  pf.purpose, 
  pf.feature_style, 
  pf.filter_style, 
  pf.feature_code, 
  pf.timestamp, 
  pf.updated_timestamp 
FROM 
  cscart_product_features AS pf 
  LEFT JOIN cscart_product_features_descriptions ON cscart_product_features_descriptions.feature_id = pf.feature_id 
  AND cscart_product_features_descriptions.lang_code = 'en' 
  INNER JOIN cscart_ult_objects_sharing ON (
    cscart_ult_objects_sharing.share_object_id = pf.feature_id 
    AND cscart_ult_objects_sharing.share_company_id = 1 
    AND cscart_ult_objects_sharing.share_object_type = 'product_features'
  ) 
WHERE 
  pf.feature_type = 'G' 
  AND (
    pf.feature_id IN ('') 
    OR pf.feature_id NOT IN (
      SELECT 
        parent_id 
      FROM 
        cscart_product_features
    )
  ) 
  AND pf.display_on_product = 'Y' 
  AND (
    pf.categories_path = '' 
    OR ISNULL(pf.categories_path) 
    OR FIND_IN_SET(268, pf.categories_path) 
    OR FIND_IN_SET(273, pf.categories_path)
  ) 
ORDER BY 
  pf.position, 
  cscart_product_features_descriptions.description

Query time 0.00195

JSON explain

{
  "query_block": {
    "select_id": 1,
    "filesort": {
      "sort_key": "pf.position, cscart_product_features_descriptions.description",
      "temporary_table": {
        "nested_loop": [
          {
            "table": {
              "table_name": "pf",
              "access_type": "ALL",
              "possible_keys": ["PRIMARY"],
              "rows": 15,
              "filtered": 100,
              "attached_condition": "pf.feature_type = 'G' and (pf.feature_id = '' or !<in_optimizer>(pf.feature_id,pf.feature_id in (subquery#2))) and pf.display_on_product = 'Y' and (pf.categories_path = '' or pf.categories_path is null or find_in_set(268,pf.categories_path) or find_in_set(273,pf.categories_path))"
            }
          },
          {
            "table": {
              "table_name": "cscart_product_features_descriptions",
              "access_type": "eq_ref",
              "possible_keys": ["PRIMARY"],
              "key": "PRIMARY",
              "key_length": "9",
              "used_key_parts": ["feature_id", "lang_code"],
              "ref": ["u358358020_main.pf.feature_id", "const"],
              "rows": 1,
              "filtered": 100,
              "attached_condition": "trigcond(cscart_product_features_descriptions.lang_code = 'en')"
            }
          },
          {
            "table": {
              "table_name": "cscart_ult_objects_sharing",
              "access_type": "eq_ref",
              "possible_keys": ["PRIMARY"],
              "key": "PRIMARY",
              "key_length": "159",
              "used_key_parts": [
                "share_object_id",
                "share_company_id",
                "share_object_type"
              ],
              "ref": ["u358358020_main.pf.feature_id", "const", "const"],
              "rows": 1,
              "filtered": 100,
              "attached_condition": "cscart_ult_objects_sharing.share_object_id = pf.feature_id and cscart_ult_objects_sharing.share_object_type = 'product_features'",
              "using_index": true
            }
          }
        ],
        "subqueries": [
          {
            "materialization": {
              "query_block": {
                "select_id": 2,
                "nested_loop": [
                  {
                    "table": {
                      "table_name": "cscart_product_features",
                      "access_type": "ALL",
                      "rows": 15,
                      "filtered": 100
                    }
                  }
                ]
              }
            }
          }
        ]
      }
    }
  }
}