Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1df35c89340e3d015ba4d1bd05ad575a17242806354dcbdb29d1b03558f4a7fd' 
  AND token = 'iYwW1HmImIQHNki/0nB/uc5wI3/Z2oyAWjf7QhTi/4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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