Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3281a6450ade136370a08a48f15c1afcef33f6f66568ae0e0509bac7665a68f' 
  AND token = 'JPkEDrziDZok+RD5Ya5pq6FFZB+RvpVAjgqKlMjKtL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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