Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b3dd128aa83691b28f3268e311c51e436e2fd0412a4933c81e7431773617e2a' 
  AND token = '1STr3QsQ2hUb2QsfujFLzwcjdSAKkohckMvwz38YCz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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