Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b723b944a7064f8ffe45f90d652a244e5e9e8806079aef7b9230d068b10c9c' 
  AND token = '5tpM3DLNHk7sDeNbjSdIzBxX03FVu0c+v9pWRV4YybQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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