Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8a5eb38f021e21e30a5e674152e74946053cffde9e4e5d1e7c7d8c2cd0f1d90' 
  AND token = 'AWSs6e/nDjulX5F4r9rkbwGH9xqBGQTBKI/Cb2Qmzow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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