SELECT 
  * 
FROM 
  cscart_product_options_exceptions 
WHERE 
  product_id = 636 
ORDER BY 
  exception_id

Query time 0.00051

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE cscart_product_options_exceptions ref product product 3 const 2 Using where; Using filesort

Result

exception_id product_id combination
3508 636 a:1:{i:1218;s:5:"22771";}
3509 636 a:1:{i:1218;s:5:"22776";}