SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (9690, 10256, 9998, 9687)

Query time 0.00039

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": 4,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (9690,10256,9998,9687)"
    }
  }
}

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 fiscal_data_1212 mark_code_type parent_product_id yml2_brand yml2_origin_country yml2_store yml2_pickup yml2_delivery yml2_adult yml2_delivery_options yml2_bid yml2_model yml2_sales_notes yml2_type_prefix yml2_offer_type yml2_market_category yml2_manufacturer_warranty yml2_expiry yml2_purchase_price yml2_description yml2_cpa units_in_product show_price_per_x_units source_import_key is_stock_split_by_warehouses ab__stickers_manual_ids ab__stickers_generated_ids allow_fractional_amount product_amount_step sale_type
9687 71956 P A 1 0.00 237 1.000 0 0 0 0.00 0 1606584966 1776154757 0 N N N B N R Y N N Y 10 0 S 0 0 7 N 0 P F a:5:{s:16:"min_items_in_box";i:1;s:16:"max_items_in_box";i:1;s:10:"box_length";i:7;s:9:"box_width";i:30;s:10:"box_height";i:40;} 1 0 N a:0:{} 0 0 Y 0.000 1.000 Y 30 N 0
9690 71954 P A 1 0.00 165 1.000 0 0 0 0.00 0 1606584966 1776154757 0 N N N B N R Y N N Y 10 0 S 0 0 7 N 0 P F a:5:{s:16:"min_items_in_box";i:1;s:16:"max_items_in_box";i:1;s:10:"box_length";i:7;s:9:"box_width";i:30;s:10:"box_height";i:40;} 1 0 N a:0:{} 0 0 Y 0.000 1.000 Y 31 N 0
9998 71246 P A 1 0.00 363.68 0.500 0 0 0 0.00 0 1608812671 1776154757 0 N N N B N R Y N N Y 10 0 S 0 0 7 N 0 P F a:5:{s:16:"min_items_in_box";i:1;s:16:"max_items_in_box";i:1;s:10:"box_length";i:6;s:9:"box_width";i:6;s:10:"box_height";i:160;} 1 0 N a:0:{} 0 0 Y 0.000 1.000 Y 43 0
10256 71941 P A 1 0.00 525.21 0.000 0 0 0 0.00 0 1615895462 1776154757 0 N N N B N R Y N N Y 10 0 S 0 0 7 N 0 P F 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;} 1 0 N a:0:{} 0 0 Y 0.000 1.000 Y 0