SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bd09d9f7d7a7592c2c50c046984df3364eea80c4f7a07516e2a0444ed68305e' 
  AND token = 'hLbSM1g3HbCiK2++7ZqrCcWzfUym/MZzETvaV1RRwsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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