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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30895a3e8ba0d6dc97a4cb49213f7169eadb0f415f45388e810ab845c1e2fef7' 
  AND token = 'wuDhmTqrPLOqde/JPY+zw6//cU2oLc/U8G5DYdRkkOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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