Sandbox

SELECT 
  cscart_images.*, 
  cscart_images_links.*, 
  cscart_common_descriptions.description AS alt, 
  cscart_images.image_id AS images_image_id 
FROM 
  cscart_images_links 
  LEFT JOIN cscart_images ON cscart_images_links.image_id = cscart_images.image_id 
  LEFT JOIN cscart_common_descriptions ON cscart_common_descriptions.object_id = cscart_images.image_id 
  AND cscart_common_descriptions.object_holder = 'images' 
  AND cscart_common_descriptions.lang_code = 'en' 
WHERE 
  cscart_images_links.object_type = 'promo' 
  AND cscart_images_links.type = 'M' 
  AND cscart_images_links.object_id IN (40) 
ORDER BY 
  cscart_images_links.position, 
  cscart_images_links.pair_id

Query time 0.00050

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	cscart_images_links	ref	object_id	object_id	81	const,const,const	1	Using index condition; Using where; Using filesort
1	SIMPLE	cscart_images	eq_ref	PRIMARY	PRIMARY	4	cscart_dev_4_16.cscart_images_links.image_id	1
1	SIMPLE	cscart_common_descriptions	eq_ref	PRIMARY	PRIMARY	107	cscart_dev_4_16.cscart_images.image_id,const,const	1	Using where

Result

image_id	image_path	image_x	image_y	is_high_res	pair_id	object_id	object_type	detailed_id	type	position	alt	images_image_id
1305	banner_en_pickup_ok56-7h.png	434	185	N	3242	40	promo	0	M	0		1305