Sandbox

SELECT 
  1 
FROM 
  cscart_ec_print_temp_designs 
WHERE 
  session_id = 'RX19-0PPC-L4RT-MA0P-N3T7-DYYR-FLPE-JT6U' 
  AND product_id = 49 
  AND expires_at > 1771079736 
  AND confirmed = 'Y' 
LIMIT 
  1

Query time 0.00054

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}