Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '174d6e1a25f0973a62345ecc47fd37a3c755aa918d59e9c686745938e0f5b312' 
  AND token = 'EKwKdLotLgacQoGMfvkRYRAtMWb9FPy+FZdV6qiyyVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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