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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa3e2f3e0a08cc76ab11480821987de027e64743ffa9b69dadad85adb52c0211' 
  AND token = '8YsWzcFSTU0YnHigSyDoL1PjlJEfAQxgPYv2c86OcBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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