Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f3b55b7ba6e75b115418cff87437ff3331e3663b943c352f0f302811a212d14' 
  AND token = 'pX16y3LOTEEIYFxrVTcOlPmdGjv3FTuTQHBabZeSRiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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