Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2770bb3ae7d1e8dddc94c5e6bc7d4ee8f3bf21fdb5873761268a5b369931a4a2' 
  AND token = 'Q/bzV9S/jY+cWhe4+V2tLm2csocCeUlKwTiHoanj8Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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