Sandbox

SELECT 
  1 
FROM 
  cscart_ec_print_temp_designs 
WHERE 
  session_id = '3NZ0-M7I2-5X4A-J726-2DV8-QQKT-LQTW-A5C9' 
  AND product_id = 34 
  AND expires_at > 1770197143 
  AND confirmed = 'Y' 
LIMIT 
  1

Query time 0.00037

JSON explain

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