SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '452cd7a56f4db19dfe25a78a8dfcb11496170ccfd7e777fb7dfba1caf1e22699' 
  AND token = 'UASwJQRztOLNYEd8++6Hj4JvM+yg6C/P5ajwsouTV1I=' 
  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"
    }
  }
}