SELECT 
  * 
FROM 
  cscart_product_options_exceptions 
WHERE 
  product_id = 526 
ORDER BY 
  exception_id

Query time 0.00026

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 4 Using where; Using filesort

Result

exception_id product_id combination
2779 526 a:2:{i:873;s:5:"17765";i:905;s:5:"18125";}
2780 526 a:2:{i:873;s:5:"17766";i:905;s:5:"18125";}
2781 526 a:2:{i:873;s:5:"17767";i:905;s:5:"18125";}
2782 526 a:2:{i:873;s:5:"17768";i:905;s:5:"18125";}