Sandbox

SELECT 
  1 
FROM 
  cscart_june_setupec_print_temp_designs 
WHERE 
  session_id = '0155-93UQ-QOLA-LJ4G-5T9V-VP9S-I7FC-PT0T' 
  AND product_id = 4 
  AND expires_at > 1781891608 
  AND confirmed = 'Y' 
LIMIT 
  1

Query time 0.00042

JSON explain

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