Sandbox

SELECT 
  1 
FROM 
  cscart_ec_print_temp_designs 
WHERE 
  session_id = 'VLIP-6OGP-OD9V-OTX2-5A7J-ZZVI-LIW8-TI54' 
  AND product_id = 151 
  AND expires_at > 1770181196 
  AND confirmed = 'Y' 
LIMIT 
  1

Query time 0.00037

JSON explain

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