Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ff55fe91ce586c2c1d47494ac13918e58c92e88e1cd177bb558c6cc84a2db94' 
  AND token = '3csNj1ANhvUJyaNuor0ZFUL96NceJtoMEJR6+U8al1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}