SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a12b8db6812c7364d618fcfda719193450de33d0872c5e440d947a72a2e1490' 
  AND token = 'wBrJcHHE+ImCshFPPGfIJsVHwPqVKldW3xopl25SFiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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