SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '192cc030ed191dabbeb3226872ecd49658f1179c14e9f2de68e8eb31faaf42c8' 
  AND token = 'DpWAo6JnVlzqXQD6jwi+dAQkUe/Vi0vLP8yHPBDZYPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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