Sandbox

SELECT 
  * 
FROM 
  cscart_bm_locations as l 
  LEFT JOIN cscart_bm_locations_descriptions as d ON d.location_id = l.location_id 
  AND d.lang_code = 'tr' 
WHERE 
  l.layout_id = 2 
  AND l.is_default = 1 
ORDER BY 
  l.is_default desc

Query time 0.00020

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	l	ALL					36	Using where
1	SIMPLE	d	eq_ref	PRIMARY	PRIMARY	10	hobilifedt.l.location_id,const	1	Using where

Result

location_id	dispatch	is_default	layout_id	object_ids	custom_html	position	lang_code	name	title	meta_description	meta_keywords
20	default	1	2			10	tr	Default