Sandbox

SELECT 
  *, 
  amount AS pure_amount 
FROM 
  cscart_reward_points 
WHERE 
  object_id = 828 
  AND object_type = 'C' 
  AND company_id = 0 
  AND amount > 0 
  AND usergroup_id IN(0, 1) 
ORDER BY 
  amount_type ASC, 
  amount ASC 
LIMIT 
  1

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}