Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a478cab90d9a10cf86fb1d7b5c4cfc97a7f6e42e8b4ba8ba02446b135c1a813a' 
  AND token = '+76X/gL/3DWIYtLxRJfDdaJjpxU+86nmpMiD/QaAy+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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