SELECT 
  COUNT(DISTINCT cv.video_id) 
FROM 
  cscart_cp_videos cv 
  LEFT JOIN cscart_cp_video_descriptions cvd ON cvd.video_id = cv.video_id 
  AND cvd.lang_code = 'en' 
WHERE 
  1 
  AND cv.video_id IN (
    2463, 2462, 2461, 2418, 2416, 2409, 2407, 
    2404, 2364, 2361, 2346, 2343, 2342, 
    2341
  ) 
  AND cv.status = 'A'

Query time 0.00056

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "13.10"
    },
    "nested_loop": [
      {
        "table": {
          "table_name": "cv",
          "access_type": "range",
          "possible_keys": [
            "PRIMARY",
            "status_idx",
            "video_id_idx",
            "idx_cp_videos_status_userid_videoid",
            "idx_status_timestamp"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "video_id"
          ],
          "key_length": "3",
          "rows_examined_per_scan": 14,
          "rows_produced_per_join": 9,
          "filtered": "67.15",
          "index_condition": "(`cscart_db`.`cv`.`video_id` in (2463,2462,2461,2418,2416,2409,2407,2404,2364,2361,2346,2343,2342,2341))",
          "cost_info": {
            "read_cost": "8.87",
            "eval_cost": "0.94",
            "prefix_cost": "9.81",
            "data_read_per_join": "14K"
          },
          "used_columns": [
            "video_id",
            "status"
          ],
          "attached_condition": "(`cscart_db`.`cv`.`status` = 'A')"
        }
      },
      {
        "table": {
          "table_name": "cvd",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "video_id",
            "lang_code"
          ],
          "key_length": "9",
          "ref": [
            "cscart_db.cv.video_id",
            "const"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 9,
          "filtered": "100.00",
          "using_index": true,
          "cost_info": {
            "read_cost": "2.35",
            "eval_cost": "0.94",
            "prefix_cost": "13.10",
            "data_read_per_join": "39K"
          },
          "used_columns": [
            "video_id",
            "lang_code"
          ]
        }
      }
    ]
  }
}