<div class="image-wrapper">
  <img src="https://via.placeholder.com/350x150" alt="">
</div>

.image-wrapper {
  position: relative;
  float: left;
}

.image-wrapper > img {
  display: block;
}

.image-wrapper::after {
  display: block;
  content: '';
  position: absolute;
  left: -100%;
  top: 0;
  width: 100%;
  height: 100%;
  background-image: linear-gradient(135deg, transparent 44.75%, #fff3 45%, #fff3 55%, transparent 55.25%);
  z-index: 1;
}

.image-wrapper:hover::after {
  animation: blink 0.5s linear 1;
}

@keyframes blink {
  from {
    left: -100%;
  }
  
  to {
    left: 100%;
  }
}