Sandbox

SELECT 
  1 
FROM 
  cscart_aprilec_print_temp_designs 
WHERE 
  session_id = 'NFYR-R05A-A1FI-3VRX-GJ87-XCZV-4BOF-GHKP' 
  AND product_id = 188 
  AND expires_at > 1777643618 
  AND confirmed = 'Y' 
LIMIT 
  1

Query time 0.00046

JSON explain

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