Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e6d2e6ba97b2b0cbee42cfb1e7ef084778df693153bd38acf32d5c029edeb3' 
  AND token = 'KyZc7+Mxm1laWYmUDQDOHHgNgzBMm6k4t+VrtYqTEdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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