SELECT 
  cscart_product_filters.feature_id, 
  cscart_product_filters.filter_id, 
  cscart_product_filters.field_type, 
  cscart_product_filters.round_to, 
  cscart_product_filters.display, 
  cscart_product_filters.display_count, 
  cscart_product_filter_descriptions.filter, 
  cscart_product_features.feature_type, 
  cscart_product_features.filter_style, 
  cscart_product_features_descriptions.prefix, 
  cscart_product_features_descriptions.suffix 
FROM 
  cscart_product_filters 
  LEFT JOIN cscart_product_filter_descriptions ON cscart_product_filter_descriptions.filter_id = cscart_product_filters.filter_id 
  AND cscart_product_filter_descriptions.lang_code = 'de' 
  LEFT JOIN cscart_product_features ON cscart_product_features.feature_id = cscart_product_filters.feature_id 
  LEFT JOIN cscart_product_features_descriptions ON cscart_product_features_descriptions.feature_id = cscart_product_filters.feature_id 
  AND cscart_product_features_descriptions.lang_code = 'de' 
WHERE 
  cscart_product_filters.status = 'A' 
  AND (
    cscart_product_filters.categories_path = '' 
    OR FIND_IN_SET(
      20, cscart_product_filters.categories_path
    )
  ) 
ORDER BY 
  cscart_product_filters.position, 
  cscart_product_filter_descriptions.filter

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.03892928,
    "filesort": {
      "sort_key": "cscart_product_filters.position, cscart_product_filter_descriptions.filter",
      "temporary_table": {
        "nested_loop": [
          {
            "table": {
              "table_name": "cscart_product_filters",
              "access_type": "ALL",
              "loops": 1,
              "rows": 9,
              "cost": 0.0123218,
              "filtered": 100,
              "attached_condition": "cscart_product_filters.`status` = 'A' and (cscart_product_filters.categories_path = '' or find_in_set(20,cscart_product_filters.categories_path))"
            }
          },
          {
            "table": {
              "table_name": "cscart_product_filter_descriptions",
              "access_type": "eq_ref",
              "possible_keys": ["PRIMARY"],
              "key": "PRIMARY",
              "key_length": "9",
              "used_key_parts": ["filter_id", "lang_code"],
              "ref": [
                "u428615623_ecartifygonje.cscart_product_filters.filter_id",
                "const"
              ],
              "loops": 9,
              "rows": 1,
              "cost": 0.00886916,
              "filtered": 100,
              "attached_condition": "trigcond(cscart_product_filter_descriptions.lang_code = 'de')"
            }
          },
          {
            "table": {
              "table_name": "cscart_product_features",
              "access_type": "eq_ref",
              "possible_keys": ["PRIMARY"],
              "key": "PRIMARY",
              "key_length": "3",
              "used_key_parts": ["feature_id"],
              "ref": ["u428615623_ecartifygonje.cscart_product_filters.feature_id"],
              "loops": 9,
              "rows": 1,
              "cost": 0.00886916,
              "filtered": 100
            }
          },
          {
            "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": [
                "u428615623_ecartifygonje.cscart_product_filters.feature_id",
                "const"
              ],
              "loops": 9,
              "rows": 1,
              "cost": 0.00886916,
              "filtered": 100,
              "attached_condition": "trigcond(cscart_product_features_descriptions.lang_code = 'de')"
            }
          }
        ]
      }
    }
  }
}