Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '174c6bd47af3394859c88f11f209dcb7d9a20439fba384b1a2d8ae626c137cd0' 
  AND token = 'LqjGaKwJrUsIL7ICuHOjc5SQiYk8PcbLOhEDSuAXik8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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