SELECT 
  category_id, 
  ab__lc_catalog_image_control 
FROM 
  cscart_categories 
WHERE 
  category_id in (
    '282', '272', '266', '285', '287', '276', 
    '278', '290'
  )

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_categories",
          "access_type": "range",
          "possible_keys": ["PRIMARY", "p_category_id"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["category_id"],
          "rows": 8,
          "filtered": 100,
          "index_condition": "cscart_categories.category_id in ('282','272','266','285','287','276','278','290')"
        }
      }
    ]
  }
}