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SELECT 
  * 
FROM 
  cscart_ap_products 
where 
  product_id = 4

Query time 0.00117

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_ap_products",
      "access_type": "ALL",
      "rows": 7,
      "filtered": 100,
      "attached_condition": "(`_testcscart`.`cscart_ap_products`.`product_id` = 4)"
    }
  }
}

Result

id	product_id	classic_width	classic_depth	min_width	min_depth	max_width	max_depth	min_height	max_height	classic_height	height	weight	size	painting	material	about_assembly	other	other_content	other_content2	other_content3
4	4	122	123	80	90	150	160				0	0	0