SELECT 
  bundle_image_id, 
  bundle_id 
FROM 
  cscart_product_bundle_images 
WHERE 
  bundle_id IN (3)

Query time 0.00152

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_product_bundle_images",
      "access_type": "ref",
      "possible_keys": ["bundle_id"],
      "key": "bundle_id",
      "key_length": "4",
      "used_key_parts": ["bundle_id"],
      "ref": ["const"],
      "rows": 2,
      "filtered": 100
    }
  }
}