SELECT 
  * 
FROM 
  cscart_product_options_exceptions 
WHERE 
  product_id = 9931 
ORDER BY 
  exception_id

Query time 0.00022

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
1162 9931 a:2:{i:595;s:5:"15420";i:596;s:2:"-1";}
1163 9931 a:2:{i:595;s:5:"15425";i:596;s:2:"-1";}