SELECT 
  * 
FROM 
  cscart_ap_site_setting 
LIMIT 
  1

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_ap_site_setting",
      "access_type": "ALL",
      "rows": 1,
      "filtered": 100
    }
  }
}

Result

id main_phrase1 main_phrase2 sub_phrase top_board_width_opt top_board_depth_opt height_opt
1 木と鉄と電気の ハンドメイド家具 Handmade furnitureof wood,iron and lighting 1 2 4