Sandbox

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 = 31 
  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 0.00028

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	storefront_values	system	PRIMARY,storefront_id,company_id				0	const row not found
1	SIMPLE	cscart_settings_objects	ref	section_id	section_id	4	const	10	Using where; Using filesort

Result

object_id	name	section_id	section_tab_id	type	position	is_global	description	value
5726	newsletters_per_pass	31	32	I	0	N	newsletters_per_pass	10
5735	coupon	31	33	S	0	N	coupon
5728	mailer_send_method	31	32	S	20	N	mailer_send_method	default
5730	mailer_smtp_host	31	32	I	40	N	mailer_smtp_host
5731	mailer_smtp_username	31	32	I	50	N	mailer_smtp_username
5732	mailer_smtp_password	31	32	I	60	N	mailer_smtp_password
5733	mailer_smtp_ecrypted_connection	31	32	S	70	N	mailer_smtp_ecrypted_connection	none
5734	mailer_smtp_auth	31	32	C	80	N	mailer_smtp_auth	N