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SELECT 
  * 
FROM 
  cscart_product_options_exceptions 
WHERE 
  product_id = 9939 
ORDER BY 
  exception_id

Query time 0.00031

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	8	Using where; Using filesort

Result

exception_id	product_id	combination
810	9939	a:1:{i:625;s:5:"15193";}
811	9939	a:1:{i:625;s:5:"15195";}
812	9939	a:1:{i:625;s:5:"15197";}
813	9939	a:1:{i:625;s:5:"15199";}
814	9939	a:1:{i:625;s:5:"15200";}
815	9939	a:1:{i:625;s:5:"15209";}
816	9939	a:1:{i:625;s:5:"15207";}
817	9939	a:1:{i:625;s:5:"15208";}