SELECT 
  * 
FROM 
  cscart_product_options_inventory 
WHERE 
  product_id = 10670 
  AND combination_hash = '3341562556'

Query time 0.00024

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE cscart_product_options_inventory const PRIMARY,pc PRIMARY 4 const 1

Result

product_id product_code combination_hash combination amount temp position price weight min_qty max_qty qty_step list_qty_count aval_status
10670 SKY-OD3T-5/7-48-7043 3341562556 1279_23587_1280_23603 0.00 N 0 1431.00 25.00 0 0 0 0 6