SELECT 
  cscart_settings_objects.object_id as object_id, 
  cscart_settings_objects.type as object_type, 
  cscart_settings_objects.name as description, 
  (
    CASE WHEN storefront_values.object_id IS NOT NULL THEN storefront_values.value ELSE cscart_settings_objects.value END
  ) AS value 
FROM 
  cscart_settings_objects 
  LEFT JOIN cscart_settings_vendor_values AS storefront_values ON storefront_values.object_id = cscart_settings_objects.object_id 
  AND storefront_values.storefront_id = 1 
  AND storefront_values.company_id = 0 
WHERE 
  1 
  AND (
    FIND_IN_SET(
      'STOREFRONT', cscart_settings_objects.edition_type
    ) 
    OR FIND_IN_SET(
      'ROOT', cscart_settings_objects.edition_type
    ) 
    OR FIND_IN_SET(
      'MVE:STOREFRONT', cscart_settings_objects.edition_type
    ) 
    OR FIND_IN_SET(
      'MVE:ROOT', cscart_settings_objects.edition_type
    )
  ) 
  AND cscart_settings_objects.object_id = 294 
ORDER BY 
  cscart_settings_objects.position

Query time 0.00165

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "storefront_values",
          "access_type": "system",
          "possible_keys": ["PRIMARY", "storefront_id", "company_id"],
          "rows": 0,
          "filtered": 0,
          "const_row_not_found": true
        }
      },
      {
        "table": {
          "table_name": "cscart_settings_objects",
          "access_type": "const",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["object_id"],
          "ref": ["const"],
          "rows": 1,
          "filtered": 100
        }
      }
    ]
  }
}

Result

object_id object_type description value
294 I cdn a:13:{s:11:"resource_id";s:20:"bc8rfxfhdcog3r44grau";s:7:"rule_id";s:0:"";s:4:"host";s:0:"";s:5:"cname";s:47:"static.cs-cart-test-domain-stage-4-20-1-test.ru";s:14:"provider_cname";s:39:"d4e85c5255c7d6e8.topology.gslb.yccdn.ru";s:11:"origin_host";s:40:"cs-cart-test-domain-stage-4-20-1-test.ru";s:14:"certificate_id";s:0:"";s:10:"is_enabled";i:0;s:9:"is_active";b:1;s:7:"service";s:6:"yandex";s:3:"key";s:0:"";s:6:"secret";s:0:"";s:2:"id";s:0:"";}