Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e3090457dd2d89e6ba68fd5ce16d16f94538cb1150d6b7735fe5ad5bf4ca3ca' 
  AND token = 'wcA/nbFpM4QSz6eJs/mLDth0gUHu3ZWNZyZCwlywP9A=' 
  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"
    }
  }
}