Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10b224d10922dde1286ea136a3d8a76b8a0c482c1a7189715acdd7bed508e305' 
  AND token = '8mSXG3hfBt+Wo7GgIJdgdO8A5zwe3HapRraSdOrGzGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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