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SELECT 
  cscart_settings_objects.object_id as object_id, 
  cscart_settings_objects.type as object_type, 
  cscart_settings_objects.name as description, 
  (
    CASE WHEN company_values.object_id IS NOT NULL THEN company_values.value 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 company_values ON company_values.object_id = cscart_settings_objects.object_id 
  AND company_values.company_id = 1 
  AND company_values.storefront_id = 1 
  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(
      'VENDOR', cscart_settings_objects.edition_type
    ) 
    OR FIND_IN_SET(
      'ROOT', cscart_settings_objects.edition_type
    ) 
    OR FIND_IN_SET(
      'ULT:STOREFRONT', cscart_settings_objects.edition_type
    ) 
    OR FIND_IN_SET(
      'ULT:VENDOR', cscart_settings_objects.edition_type
    ) 
    OR FIND_IN_SET(
      'ULT:ROOT', cscart_settings_objects.edition_type
    )
  ) 
  AND cscart_settings_objects.object_id = 6868 
ORDER BY 
  cscart_settings_objects.position

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "const_condition": "1",
    "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
    },
    "table": {
      "table_name": "company_values",
      "access_type": "const",
      "possible_keys": ["PRIMARY", "storefront_id", "company_id"],
      "key": "PRIMARY",
      "key_length": "11",
      "used_key_parts": ["object_id", "company_id", "storefront_id"],
      "ref": ["const", "const", "const"],
      "rows": 0,
      "filtered": 0,
      "unique_row_not_found": true
    },
    "table": {
      "table_name": "storefront_values",
      "access_type": "const",
      "possible_keys": ["PRIMARY", "storefront_id", "company_id"],
      "key": "PRIMARY",
      "key_length": "11",
      "used_key_parts": ["object_id", "company_id", "storefront_id"],
      "ref": ["const", "const", "const"],
      "rows": 0,
      "filtered": 0,
      "unique_row_not_found": true
    }
  }
}

Result

object_id	object_type	description	value
6868	R	crm_countries_list	other