SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6944cc37fe87ba1566b3948660871a5b3e389122677c9014f89e02129e0861' 
  AND token = 'JoiThi/wmqGz71YxqpZTyNCbJiL16nejrf2FnlUGwZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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