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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '311cab969edf9a8b003a688dce2d604309b6b08df0fc2cdcfe8267b6e2941183' 
  AND token = '1eRcJC2Q+O+yZcBu3XYYtFe3NRx5zb1shqpc6f/W4DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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