Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c803b8b16de01f3e0455201c7c3c4f9f28537418046250e4914fb1be5ab1eb5d' 
  AND token = 'JsnnraA4ZDbnSK9o79u1dvSkE6NqDvpE0AF67OgSbRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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