SELECT 
  cscart_ab__video_gallery.video_id, 
  cscart_ab__video_gallery.product_id, 
  cscart_ab__video_gallery.status, 
  cscart_ab__video_gallery.pos, 
  cscart_ab__video_gallery.icon_type, 
  cscart_ab__video_gallery_descriptions.youtube_id, 
  cscart_ab__video_gallery_descriptions.title, 
  cscart_ab__video_gallery_descriptions.description 
FROM 
  cscart_ab__video_gallery 
  LEFT JOIN cscart_ab__video_gallery_descriptions ON cscart_ab__video_gallery_descriptions.video_id = cscart_ab__video_gallery.video_id 
  AND cscart_ab__video_gallery_descriptions.lang_code = 'ru' 
WHERE 
  cscart_ab__video_gallery.product_id = 349 
  AND cscart_ab__video_gallery.status = "A" 
ORDER BY 
  cscart_ab__video_gallery.pos ASC

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "read_sorted_file": {
      "filesort": {
        "sort_key": "cscart_ab__video_gallery.pos",
        "table": {
          "table_name": "cscart_ab__video_gallery",
          "access_type": "ref",
          "possible_keys": ["status", "product_id"],
          "key": "product_id",
          "key_length": "3",
          "used_key_parts": ["product_id"],
          "ref": ["const"],
          "rows": 1,
          "filtered": 100,
          "attached_condition": "cscart_ab__video_gallery.product_id <=> 349 and cscart_ab__video_gallery.`status` = 'A'"
        }
      }
    },
    "table": {
      "table_name": "cscart_ab__video_gallery_descriptions",
      "access_type": "eq_ref",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "9",
      "used_key_parts": ["video_id", "lang_code"],
      "ref": ["noframes_kz_new.cscart_ab__video_gallery.video_id", "const"],
      "rows": 1,
      "filtered": 100,
      "attached_condition": "trigcond(cscart_ab__video_gallery_descriptions.lang_code = 'ru')"
    }
  }
}