SELECT 
  category_id, 
  category 
FROM 
  cscart_category_descriptions 
WHERE 
  lang_code = 'en'

Query time 0.00119

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "190.10"
    },
    "table": {
      "table_name": "cscart_category_descriptions",
      "access_type": "ALL",
      "rows_examined_per_scan": 1881,
      "rows_produced_per_join": 188,
      "filtered": "10.00",
      "cost_info": {
        "read_cost": "171.29",
        "eval_cost": "18.81",
        "prefix_cost": "190.10",
        "data_read_per_join": "570K"
      },
      "used_columns": [
        "category_id",
        "lang_code",
        "category"
      ],
      "attached_condition": "(`nuie_scalesta_net`.`cscart_category_descriptions`.`lang_code` = 'en')"
    }
  }
}