Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7727cb5a50adb37791e3ff5d92a163461e3c459fce682b1f63aed59f20f1ca60' 
  AND token = 'R6b0vwaKdc/w+vsHw27d9AEjNIoSDLwS7kUyWXI/r+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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