SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (322, 306, 307, 323, 350)

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_products",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "3",
      "used_key_parts": ["product_id"],
      "rows": 5,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (322,306,307,323,350)"
    }
  }
}

Result

product_id product_code product_type status company_id list_price amount weight length width height shipping_freight low_avail_limit timestamp updated_timestamp usergroup_ids is_edp edp_shipping unlimited_download tracking free_shipping zero_price_action is_pbp is_op is_oper is_returnable return_period avail_since out_of_stock_actions localization min_qty max_qty qty_step list_qty_count tax_ids age_verification age_limit options_type exceptions_type details_layout shipping_params facebook_obj_type parent_product_id __variation_code __variation_options __is_default_variation
306 PSA72 P A 1 7776.00 11 61.000 0 0 0 0.00 0 1432047600 1560996571 0 N N N B N R Y N N Y 10 0 S 0 5 1 5 7,8 N 0 P A default a:5:{s:16:"min_items_in_box";i:0;s:16:"max_items_in_box";i:0;s:10:"box_length";i:0;s:9:"box_width";i:0;s:10:"box_height";i:0;} activity 0 N
307 PU40 P A 1 6696.00 6 37.000 0 0 0 0.00 0 1432047600 1560996571 0 N N N B N R Y N N Y 10 0 S 0 5 1 5 7,8 N 0 P F default a:5:{s:16:"min_items_in_box";i:0;s:16:"max_items_in_box";i:0;s:10:"box_length";i:0;s:9:"box_width";i:0;s:10:"box_height";i:0;} activity 0 N
322 PC14 P A 1 7560.00 11 35.000 0 0 0 0.00 0 1432134000 1560996571 0 N N N B N R Y N N Y 10 1547046000 B 0 5 1 5 7,8 N 0 P F default a:5:{s:16:"min_items_in_box";i:0;s:16:"max_items_in_box";i:0;s:10:"box_length";i:0;s:9:"box_width";i:0;s:10:"box_height";i:0;} activity 0 N
323 PL12N P A 1 8964.00 4 80.000 0 0 0 0.00 0 1432134000 1560996571 0 N N N B N R Y N N Y 10 1550588400 B 0 5 1 5 7,8 N 0 P F default a:5:{s:16:"min_items_in_box";i:0;s:16:"max_items_in_box";i:0;s:10:"box_length";i:0;s:9:"box_width";i:0;s:10:"box_height";i:0;} activity 0 N
350 TLLW1 P A 1 200.00 527 0.000 0 0 0 0.00 0 1432134000 1560996571 0 N N N B N R Y N N Y 10 0 S 0 5 1 5 7,8 N 0 P F default a:5:{s:16:"min_items_in_box";i:0;s:16:"max_items_in_box";i:0;s:10:"box_length";i:0;s:9:"box_width";i:0;s:10:"box_height";i:0;} activity 0 N