SELECT 
  cscart_settings_objects.object_id as object_id, 
  name, 
  section_id, 
  section_tab_id, 
  type, 
  position, 
  is_global, 
  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 section_id = 129 
  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.type <> 'H' 
ORDER BY 
  cscart_settings_objects.position

Query time 0.00086

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "storefront_values",
      "access_type": "system",
      "possible_keys": ["PRIMARY", "storefront_id", "company_id"],
      "rows": 0,
      "filtered": 0,
      "const_row_not_found": true
    },
    "read_sorted_file": {
      "filesort": {
        "sort_key": "cscart_settings_objects.position",
        "table": {
          "table_name": "cscart_settings_objects",
          "access_type": "ref",
          "possible_keys": ["section_id"],
          "key": "section_id",
          "key_length": "4",
          "used_key_parts": ["section_id"],
          "ref": ["const"],
          "rows": 15,
          "filtered": 100,
          "attached_condition": "cscart_settings_objects.section_id <=> 129 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.`type` <> 'H'"
        }
      }
    }
  }
}

Result

object_id name section_id section_tab_id type position is_global description value
6003 newsletters_per_pass 129 130 I 0 N newsletters_per_pass 10
6012 coupon 129 131 S 0 N coupon
6013 coupon1 129 131 S 10 N coupon1
6005 mailer_send_method 129 130 S 20 N mailer_send_method default
6007 mailer_smtp_host 129 130 I 40 N mailer_smtp_host
6008 mailer_smtp_username 129 130 I 50 N mailer_smtp_username
6009 mailer_smtp_password 129 130 I 60 N mailer_smtp_password
6010 mailer_smtp_ecrypted_connection 129 130 S 70 N mailer_smtp_ecrypted_connection none
6011 mailer_smtp_auth 129 130 C 80 N mailer_smtp_auth N