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SELECT 
  * 
FROM 
  cscart_product_options_exceptions 
WHERE 
  product_id = 3321 
ORDER BY 
  exception_id

Query time 0.00028

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
3476	3321	a:3:{i:1215;s:5:"22739";i:1214;s:5:"22754";i:1216;s:2:"-1";}
3477	3321	a:3:{i:1215;s:5:"22739";i:1214;s:5:"22755";i:1216;s:2:"-1";}
3478	3321	a:3:{i:1215;s:5:"22739";i:1214;s:5:"22756";i:1216;s:2:"-1";}
3479	3321	a:3:{i:1215;s:5:"22739";i:1214;s:5:"22757";i:1216;s:2:"-1";}
3480	3321	a:3:{i:1215;s:5:"22739";i:1214;s:5:"22758";i:1216;s:2:"-1";}
3481	3321	a:3:{i:1215;s:5:"22739";i:1214;s:5:"22759";i:1216;s:2:"-1";}
3482	3321	a:3:{i:1215;s:5:"22739";i:1214;s:5:"22760";i:1216;s:2:"-1";}
3483	3321	a:3:{i:1215;s:5:"22739";i:1214;s:5:"22761";i:1216;s:2:"-1";}