Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5f81c3c21671d9b40917de41ad91bd607340207f00fef9fc528eb997a32fc8f' 
  AND token = 'IEayegzyVzQE87ozY33mjG2ZSAEy9I+zO6SagF6Kc+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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