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

Query time 0.00776

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.002024411,
    "nested_loop": [
      {
        "table": {
          "table_name": "tmall_product_bundle_images",
          "access_type": "ref",
          "possible_keys": ["bundle_id"],
          "key": "bundle_id",
          "key_length": "4",
          "used_key_parts": ["bundle_id"],
          "ref": ["const"],
          "loops": 1,
          "rows": 1,
          "cost": 0.002024411,
          "filtered": 100
        }
      }
    ]
  }
}