Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '000c4bfcb380fd2ad73450a51d364595f99f074efa10e679375976a4b080cf9f' 
  AND token = '8+YmJmf5p9JsaJAq9KKpg26bcXT6wbBJJ1rQ3KY5UGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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