Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3117bd989ae151efab2cf44354da8330b989a8cb2ed9d3dfe83b294fc8e5ec3e' 
  AND token = 'oYJ7kx5BvWd+K3UBGkbVFadkgMwaPA8xBEAhZ7Nka5w=' 
  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"
    }
  }
}