SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '732d0f25b18f9fb71747a85242b9db28c5637b3eb22560b18dee4ba16f8a147d' 
  AND token = 'TaUVHW/95g1YnaSV+jouuDZ6lUxurQg12Vu2lGGFpJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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