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SELECT 
  * 
FROM 
  cscart_product_feature_variants 
  LEFT JOIN cscart_product_feature_variant_descriptions ON cscart_product_feature_variant_descriptions.variant_id = cscart_product_feature_variants.variant_id 
  AND cscart_product_feature_variant_descriptions.lang_code = 'tr' 
WHERE 
  cscart_product_feature_variants.variant_id = 129

Query time 0.00149

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	cscart_product_feature_variants	const	PRIMARY	PRIMARY	3	const	1
1	SIMPLE	cscart_product_feature_variant_descriptions	const	PRIMARY	PRIMARY	9	const,const	1

Result

variant_id	feature_id	url	color	position	variant	description	page_title	meta_keywords	meta_description	lang_code	gr__sf_seo_variant
129	18			0	Aiko	<p>Aiko Safes is the worldwide leader protecting thousands of homes and offices in over 70 countries for over 25 years. Aiko Safes are precisely engineered to surpass the strictest industry standard to provide high security safes. AIKO safes are designed to provide maximum protection against fire and foil any tampering and break-ins<br></p>				tr