Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd56ef4fd755471a94ebd6acabe4a9106d4dbd833f0d714510f148714f86b303c' 
  AND token = 'vT+eXTajH1b6Joe+thcIOsg+NthPemqPyPbyAXBkX4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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