SELECT 
  * 
FROM 
  cscart_images_links 
  LEFT JOIN cscart_images ON cscart_images.image_id = cscart_images_links.detailed_id 
WHERE 
  object_id IN ('635129', '635130') 
  AND object_type = 'product' 
  AND type = 'M'

Query time 0.00067

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_images_links",
      "access_type": "range",
      "possible_keys": ["object_id"],
      "key": "object_id",
      "key_length": "81",
      "used_key_parts": ["object_id", "object_type", "type"],
      "rows": 2,
      "filtered": 100,
      "index_condition": "cscart_images_links.object_id in ('635129','635130') and cscart_images_links.object_type = 'product' and cscart_images_links.`type` = 'M'"
    },
    "table": {
      "table_name": "cscart_images",
      "access_type": "eq_ref",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "4",
      "used_key_parts": ["image_id"],
      "ref": ["staging2_wesave_com.cscart_images_links.detailed_id"],
      "rows": 1,
      "filtered": 100
    }
  }
}