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SELECT 
  cscart_product_filters.*, 
  cscart_product_features.feature_type 
FROM 
  cscart_product_filters 
  LEFT JOIN cscart_product_features ON cscart_product_filters.feature_id = cscart_product_features.feature_id 
WHERE 
  cscart_product_filters.filter_id = 315

Query time 0.00026

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	cscart_product_filters	const	PRIMARY	PRIMARY	3	const	1
1	SIMPLE	cscart_product_features	const	PRIMARY	PRIMARY	3	const	1

Result

filter_id	categories_path	company_id	feature_id	position	field_type	status	round_to	display_count	display	tenant_id	seo_enabled	index_type	index_with	seo_sef_filter	seo_path_order	feature_type
315		0	552	0		A	0.01	10	Y	0	Y	one_only		Y	0	M