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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8400793cab258d69727cca1b56f33987fa78c9129b43a6a8ea0895d4ed4cbf13' 
  AND token = 'XiI3qJI9sSwM/+9mGeZ8PujLRrxi9dhNHEykreNZ4Fs=' 
  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"
    }
  }
}