SELECT 
  link 
FROM 
  cscart_image_gallery 
WHERE 
  pair_id = 28523 
  AND lang_code = 'en'

Query time 0.00017

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE cscart_image_gallery const pair_id pair_id 9 const,const 1

Result

link